7205921716109 has 2 divisors, whose sum is σ = 7205921716110. Its totient is φ = 7205921716108.

The previous prime is 7205921716061. The next prime is 7205921716121. The reversal of 7205921716109 is 9016171295027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4192215300100 + 3013706416009 = 2047490^2 + 1736003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7205921716109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7205921718109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3602960858054 + 3602960858055.

It is an arithmetic number, because the mean of its divisors is an integer number (3602960858055).

Almost surely, 2^{7205921716109} is an apocalyptic number.

It is an amenable number.

7205921716109 is a deficient number, since it is larger than the sum of its proper divisors (1).

7205921716109 is an equidigital number, since it uses as much as digits as its factorization.

7205921716109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 50.

The spelling of 7205921716109 in words is "seven trillion, two hundred five billion, nine hundred twenty-one million, seven hundred sixteen thousand, one hundred nine".